# Circumference Calculator

The website for you is this circumference calculator if you need to go through some geometry problems. It is a gadget made especially for determining any circle’s diameter, circumference, and area. Read on to discover:

The circumference calculator, like all of our tools, works in all directions. It can be used to convert circumference to radius, circumference to area, radius to diameter (duh! ), radius to area, diameter to circumference, diameter to radius (yep, more rocket science), diameter to the area, area to circumference, area to diameter, or area to radius.

This equation for a circle calculator may be helpful if you wish to draw a circle on the Cartesian plane.

## Definition of circumference

The length of a circle’s edge in straight lines is its circumference. The term “perimeter” is only used to refer to polygons, but it means the same thing as the perimeter of a geometric figure. Frequently, circumference is spelled circumference.

## Formula for circumference

The following equation describes the relation between the circumference and the radius `R` of a circle:

`C = 2πR`

Where π is a constant approximately equal to 3.14159265…

## How to find the circumference of a circle

1. Determine the radius of a circle. Let’s assume it’s equal to 14 cm.
2. Substitute this value to the formula for circumference: `C = 2 * π * R = 2 * π * 14 = 87.9646 cm`.
3. You can also use it to find the area of a circle: `A = π * R² = π * 14² = 615.752 cm²`.
4. Finally, you can find the diameter – it is simply double the radius: `D = 2 * R = 2 * 14 = 28 cm`.
5. Use our circumference calculator to find the radius when you only have the circumference or area of a circle.

## Circumference to Diameter

Since diameter is twice as large as radius, you’ve already noticed that the ratio of circumference to diameter is :

C/D = 2πR / 2R = π

The ratio of circumference to diameter is how the mathematical constant pi is defined. Many fields, including physics and mathematics, utilise it. For instance, the centrifugal force calculator contains it.

## FAQ

### How to find the circumference of a circle?

To calculate the circumference, you need the radius of the circle:

1. Multiply the radius by 2 to get the diameter.
2. Multiply the result by π, or 3.14 for an estimation.
3. That’s it; you found the circumference of the circle.

Or you can use the circle’s diameter:

1. Multiply the diameter by π, or 3.14.
2. The result is the circle’s circumference.

### What is the circumference of a circle?

The length of a circle’s edge in straight lines is known as its circumference. Although the term perimeter is exclusively applied to polygons, it is identical to the perimeter of a geometric shape.

## Who calculated the circumference of the earth first?

Greek mathematician Eratosthenes was the first to determine the circumference of the Earth in 240 B.C. He found that at the summer solstice, objects in a city on the Northern Tropic do not cast a shadow at midday, but they do in a more northern position. He was able to determine the circumference of the Earth using this information and the distance between the spots.

### How do I find the diameter from the circumference?

If you want to find the diameter from the circumference of a circle, follow these steps:

1. Divide the circumference by π, or 3.14 for an estimation.
2. And that’s it; you have the circle’s diameter.

### How to find the area of a circle from the circumference?

To find the area of a circle from the circumference, follow these steps:

1. Divide the circumference by π.
2. Divide the result by 2 to get the circle’s radius.
3. Multiply the radius by itself to get its square.
4. Multiply the square by π, or 3.14 for an estimation.
5. You found the circle’s area from the circumference.

### How do I find the radius from the circumference?

To find the radius from the circumference of a circle, you have to do the following:

1. Divide the circumference by π, or 3.14 for an estimation. The result is the circle’s diameter.
2. Divide the diameter by 2.
3. There you go, you found the circle’s radius.

### How to measure the circumference?

• Calculate the circumference as 2 ⨉ radius ⨉ π.
• Calculate the circumference as diameter ⨉ π.
• Wrap a string around the object and measure the length of it.
• Use Omni’s circumference calculator.

### What is the formula for the circumference?

The formula for the circumference, if the circle’s radius is given, is:

• 2 ⨉ radius ⨉ π

Or if the circle’s circumference is given:

• Circumference ⨉ π

You can estimate π as 3.14.

### What is the circumference of a circle with a radius of 1 meter?

To calculate the circumference of a circle with a radius of 1 meter, simply follow these steps:

1. Multiply the radius by 2 to get the diameter of 2 meters.
2. Multiply the result by π, or 3.14 for an estimation.
3. And there you go; the circumference of a circle with a radius of 1 meter is 6.28 meters.

### How do I find the circumference of a cylinder?

To find the circumference of a cylinder, you have to be aware that a cylinder’s cross-section is a circle. If you know the cylinder’s radius:

1. Multiply the radius by 2 to get the diameter.
2. Multiply the result by π, or 3.14 for an estimation.
3. That’s it; you found the circumference of the cylinder.

Or you can use the cylinder’s diameter:

1. Multiply the diameter by π, or 3.14.
2. The result is the cylinder’s circumference.

### How do I find the area of a circle with a circumference of 1 meter?

If you want to find the area of a circle with a circumference of 1 meter, do the following:

1. Divide the circumference by π. This is the circle’s diameter, in this case, 31.8 centimeters.
2. Divide by 2. This result is the circle’s radius of 15.9 centimeters.
3. Multiply the radius with itself, getting the square, in our case 256 cm².
4. Multiply by π, or 3.14 for an estimation.
5. That’s it; a circle with a circumference of 1 meter has an area of 795.78 cm².
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